Hi,
You can use conditional text. The custom fields in the explanation refer to Acymailing custom fields. I'm not sure if it also works with the Joomla custom fields, so please try it yourself.
{if:field=value}Text{/if} => this will only work for default AcyMailing user fields such as name, email, language... so you could use something like {if:email=myemail@example.com}Some text for a test{/if}
If you want to test a custom field, then you have to write it differently:
field should be var.field and the value should be the dtext for the corresponding field.
{if:var.{subscriber:anrede}=Herr}Herr{/if}{if:var.{subscriber:anrede}=Frau}Frau{/if}
